Girls’ advantage over guys is that guys have balls and girls don’t.
Strength is supposed to be guys’ advantage, but if a girl is even decently strong and skilled at fighting, she can attack his balls and negate any advantage he might have.
And having no balls frees girls up to be more flexible and do higher kicks because they don’t have to protect their crotch. It also means they can use their groin for pins and holds.
If it wasn’t for the below the belt rule, maybe it’s girls who are truly better at combat.